Separator for electric accumulators



June 23, 1942. E. HAVERBECK 2,287,305

I SEPARATOR FOR ELECTRIC ACCUMULATORS Filed July 29; 1939 wood separators.

' Patented June23. 1942 u anium) STATE SQ'PATEIN "OFFIC SEPARATOR Fon. ELECTRIC AcoUMu A'rons Edgar Haverbeck, Berlin, Germany, asslgnor to The Electric Storage Battery Company, Philadelphia, Pa., a corporation oi New Jersey Application July 29, 1939, Serial No. 287,387 1 In Germany September 28, 1938 1 Claim. (01. lac-.146)

- The present invention relates to'a separator for electric accumulators, especially .for those in starter batteries for motor cars, and to a method oi manufacturing such separators. Previously in such batteries separators of glass wool have been used simultaneously in combination with plate and a sheet of glass-wool against the positive plate. The glass-wool separator prevents For this. purpose a small wooden board was placed against the negative loss of the active material or substance of a posi-.

board operations are not so simple as when a single separator can be used. Besides, in the manufacture of the'wood separator, there is a relatively greater wastage of valuable raw material, namely, of wood of special quality and origin.

These disadvantages are, on the basis of the present invention, obviated since the separator,

while indeed likewise made of the materials glass and wood, constitutes a unitary structure. accordance with this invention, the separator is a combination oi glass-wool and particles of wood, whereby these materials are still arranged in alternate superposed layers onon the other hand, are intermingled.

For a further exposition of the invention, reference may be had to the annexed drawing and specification at the end whereof the invention I will be specifically pointed out and claimed.

The drawing shows to anenlarged scale two examples of the separator in which? Fig. 1. is across-section of a separator a laminated structure K Fig. 2 is a cross-section oi a separator in which the component materials, glass-wool and wood, denee' are intermingled.

As may be seen in the example shown in Fig.1, alternate dayer's a or glass-wool and layers b of wood particles are superposed. The wood particlesmay be composed of more or less fine wood diist but wood shavings orwood .wool are parhavin ingprovided with a special edging of soft or hard rubber.

In the design the glass-wool fibers and small wood particles intermingle. In this ca's e ualso wood shavings are used to' advantage as they effect an especially good cohesion of the materials. The aforesaid strengthening or edge-binding c is conveniently used also with this type of separator.

The manufacture of the separators, according ,7

to the invention, is extremely simple. Depending on whether more orless thick glass-wool layers are used, on which the woodparticles are strewn, either a stratified of laminated (Fig. l) or a homogeneous (Fig. 2) structure of the separator is obtained. Should particularly thin glasswool layers be used, thenthese will be entirely interspersed by the wood particlesso that the completed separator has a homogeneous struc- I ture asindicated atd in Fig.2.

In manufacture, in order to eflect mutual cohesionoi the construction materials, the separator is impregnated with bindingmaterials such as glue" orgelatin and, if necessary,- pressure is applied. Rubber solutions may, however, also be used, especiallythose which produce a porous structure after vulcanization. Separators of any.

desired strength may be made by this means.

The separator according to this invention comprises the advantage that wood waste. may be used in its manufacture. mounting of the separator in the plade assembly of the accumulator-is extremely simple. While it is being well protected against the penetration or action of the active substance of the electrode plates, the separator according to this invention is distinguished by an especially low electrical resistance as compared with the double separators used up to now and mentioned at the be-,

ginning oi thisspcification. Likewise, the favorable effect of the wood of the separator on the ticularly suitable as the wood shavings cling to each other and alsoto the adjacent glass-wool layers remarkably well; The edges c oi the sepa-' rator, according to the invention, are strengthened in a manner known per se either,; for instance,,by means of a layer of lacquer or by benegative electrode platesis considerably increased through the surface of the wood particles being relatively great so that the'extractive substances of the wood come into operation in an increased Having now particularly described and ascertained the natureof the said inventionand in what manner the same is'to'be' performed, claim ismade as follows:

A separato'rior use in an electric accumulator comprising, glass-wool and wood particles inter.-

mingled and intermeshingone with 'the other and impregnated withabindipg material to form a unitary structure, said wood particles ranging in size from dust to shavings and having ccnstit uents beneficial to the negativeplates.

of separator illustrated in Fig. 2.

Furthermore, the 

